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Subject[PATCH 2/7] RT: Peter Zijlstra's suggested improvements to rt-push patch
Date
This is my own interpretation of Peter's recommended changes Steven's push-rt
patch. Just to be clear, Peter does not endorse this patch unless he himself
specifically says so ;).

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---

kernel/sched.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 0f0af6d..24b38b4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1499,7 +1499,7 @@ static int push_rt_task(struct rq *this_rq)
int dst_cpu = -1;
int ret = 0;

- BUG_ON(!spin_is_locked(&this_rq->lock));
+ assert_spin_locked(&this_rq->lock);

next_task = rt_next_highest_task(this_rq);
if (!next_task)
@@ -1553,7 +1553,8 @@ static int push_rt_task(struct rq *this_rq)
set_task_cpu(next_task, dst_cpu);
activate_task(lowest_rq, next_task, 0);

- set_tsk_need_resched(lowest_rq->curr);
+ resched_task(lowest_rq->curr);
+ schedstat_inc(this_rq, rto_schedule);

spin_unlock(&lowest_rq->lock);
ret = 1;
@@ -2290,10 +2291,9 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
* then kick other CPUs, they might run it:
*/
rq->curr_prio = current->prio;
- if (unlikely(rt_task(current) && push_rt_task(rq))) {
- schedstat_inc(rq, rto_schedule);
- smp_send_reschedule_allbutself_cpumask(current->cpus_allowed);
- }
+ if (unlikely(rq->rt_nr_running > 1))
+ push_rt_task(rq);
+
#endif
prev_state = prev->state;
_finish_arch_switch(prev);
-
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